摘要
Based on the results of four regional geological surveys of 1:50000 including Shulan County map in Jilin, taking Shulan area as the study area,the authors re-delineated the rock type assemblages, e.g. metamorphic rhyolite, metamorphic tuffaceous breccia lava, sericite-quartz schist and tremolite altered rock, etc., and the structural contacts between them. With the help of in-situ LA-ICP-MS U-Pb dating for zircons, it is concluded that the zircon crystallization ages of the metamorphic rhyolite, the metamorphic andesitic tuff breccia lava and the tremolite altered rock are 339.1±1.3 Ma(n=27,MSWD=0.78),351.8±1.7 Ma(n=21,MSWD=0.82),and 362.0±1.8 Ma(n=43, MSWD=2.2) respectively. The metamorphic complex is actually a set of tectonic melange which comprises the rocks in different types, sources, times, or tectonic settings, and was formed by tectonism.
Abstract
Based on the results of four regional geological surveys of 1:50000 including Shulan County map in Jilin, taking Shulan area as the study area,the authors re-delineated the rock type assemblages, e.g. metamorphic rhyolite, metamorphic tuffaceous breccia lava, sericite-quartz schist and tremolite altered rock, etc., and the structural contacts between them. With the help of in-situ LA-ICP-MS U-Pb dating for zircons, it is concluded that the zircon crystallization ages of the metamorphic rhyolite, the metamorphic andesitic tuff breccia lava and the tremolite altered rock are 339.1±1.3 Ma(n=27,MSWD=0.78),351.8±1.7 Ma(n=21,MSWD=0.82),and 362.0±1.8 Ma(n=43, MSWD=2.2) respectively. The metamorphic complex is actually a set of tectonic melange which comprises the rocks in different types, sources, times, or tectonic settings, and was formed by tectonism.
关键词
central Jilin /
Jifanggou metamorphic complex /
zircon LA-ICP-MS U-Pb age /
tectonic melange
Key words
central Jilin /
Jifanggou metamorphic complex /
zircon LA-ICP-MS U-Pb age /
tectonic melange
WANG Zhongcheng, LU Xiaoping, ZHAO Juan, TAO Junyu, CHEN Mingjian.
Dating for Jifanggou metamorphic complex in central Jilin and its tectonic implications[J]. 世界地质(英文版). 2017, 20(4): 200-207 https://doi.org/10.3969/j.issn.1673-9736.2017.04.02
WANG Zhongcheng, LU Xiaoping, ZHAO Juan, TAO Junyu, CHEN Mingjian.
Dating for Jifanggou metamorphic complex in central Jilin and its tectonic implications[J]. Global Geology. 2017, 20(4): 200-207 https://doi.org/10.3969/j.issn.1673-9736.2017.04.02
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